Impact Sensor: Description and Operation

Side Impact Sensor(SIS)
The release system for the side airbag consists of a SRSCM installed in the middle of the vehicle and two SIS one on the left-hand side and one on the right. Only the SRSCM is capable of deploying the airbags or the seat-belt pretensioners systems in the vehicle. In the dialog between the SRSCM and the SIS, it is the SRSCM that makes the deployment decision.

The SRSCM is supported with the side airbag function by two SIS, which act as intelligent acceleration sensors and as such back up the central airbag controller. Both the SIS continuously report the system status on the left and right-hand sides of the vehicle to the SRSCM.

It monitors the acceleration sensor continuously. The test results are reported to the SRSCM by means of periodic status signals.

WARNING: When the ignition is ON, never cause a sudden shock around the installation area of the satellite sensor by a hammer, etc. Otherwise it could cause the airbag system to unexpectedly deploy during servicing.